technical specification for for multi-meter box …€¦ · 5.02 in case of deep drawn type...

Maharashtra State Electricity Distribution Company Limited

SPECIFICATION NO. MMC: MSC-II/Multi Meter box/SMC/2018/10

TECHNICAL SPECIFICATION

FOR

FOR MULTI-METER BOX SUITABLE FOR HOUSING 4/8/12/18 NOS.OF SINGLE PHASE METERS OR THREE PHASE METERS MADE OUT OF GLASS REINFORCED POLYESTER

SHEET MOULDING COMPOUND (S3 GRADE)/ POLYCARBONATE/ CRCA MS DEEP DRAWN OR FABRICATION FOR

DISTRIBUTION SYSTEM

IN

MSEDCL

INDEX Clause No. Contents

MULTI-METER BOX SUITABEL FOR HOUSING 4/8/12/18 NOS. SINGLE

PHASE METERS OR THREE PHASE METERS MADE OUT OF GLASS

REINFORCED POLYESTER SHEET MOULDING COMPOUND (S3

GRADE)/POLYCARBONATE MATERIAL/ CRCA MS DEEP DRAWN OR

FABRICATION

1. SCOPE

2. SERVICE CONDITIONS

3. SYSTEM DETAILS

4. APPLICABLE STANDARDS

5. DESIGN & CONSTRUCTION OF BOXES

6. TESTS

7. TESTING AND MANUFACTURING FACILITIES

8. DRAWING /SAMPLE

9. MARKING/EMBOSSING

10. PACKING

11. GUARANTEED TECHNICAL PARTICULARS

12. DRAWING

MAHARASHTRA STATE ELECTRICITY DISTRIBUTION COMPANY

Technical Specifications for FOR MULTI-METER BOX SUITABLE FOR HOUSING 4/8/12/18 NOS. OF SINGLE PHASE

METERS OR THREE PHASE METERS MADE OUT OF SHEET MOULDING COMPOUND(S3 GRADE) (SMC)/POLYCARBONATE/CRCA MS DEEP DRAWN OR FABRICATION.

SPECIFICATION NO. MMC: MSC-II/Multi Meter box/SMC/2018/10

1.00 SCOPE:

Specification covers the design, manufacture, testing at works and supply of Multi-meter box made out of glass reinforced polyester sheet moulding compound (S3 grade)/ Polycarbonate/ CRCA MS Deep Drawn or Fabrication for housing 4/8/12/18 nos. of Single Phase meters or Three Phase meters. The system shall be A.C. Single phase 250 V or three phase, four wires, 433 V, 50 Hz with effectively grounded neutral. Multi-meter box made out of glass reinforced polyester sheet moulding compound (S3 grade)/ Polycarbonate shall preferably be used in coastal areas to avoid corrosion problems.

2.00 SERVICE CONDITION

The equipment to be supplied against this specification shall be suitable for satisfactory continuous operation under the following tropical conditions.

2.1 Maximum ambient temperature (Degree C) 50

2.2 Maximum temperature in shade (Degree C) 45

2.3 Minimum Temperature (Degree C) 3.5

2.4 Relative Humidity (percent) 10 to 95

2.5 Maximum Annual rain fall (mm) 1450

2.6 Maximum wind pressure (kg/sq.m) 150

2.7 Maximum altitude above mean sea level ( Meter) 1000

2.8 Isoceranic level (days per year) 50

2.9 Siesmic level (Horizontal Acceleration) 0.3 g

Moderately hot and humid tropical climate conductive to rust and fungus growth..

3.00 SYSTEM DETAILS

Multi-meter boxes are meant for housing multiple Single Phase meters or Three Phase meters with relevant system parameters as under:-

S.N. Particulars Details 1. Voltage 250 V, 1Ph

433 V, 3 Ph, (√3x 250 V) 2. Frequency 50 HZ 3. Phases 1 phase, solidly grounded neutral

3 phase, solidly grounded neutral

4.00 APPLICABLE STANDARDS

a. Glass reinforced polyester sheet moulding compound (S3 grade)- IS:13410-1992

b. Polycarbonate- IS: 14434-1998

c. For enclosure- IS 14772:2000

5.00 DESIGN & CONSTRUCTION OF BOXES:

5.01 The Multi-Meter Box shall be made from Thermosetting Plastic i.e. Glass reinforced polyester sheet moulding compound (S3 grade) conforming IS:13410-1992/ Polycarbonate conforming IS: 14434-1998/ CRCA MS Deep Drawn or Fabrication and as per requirement of this specification. The base and cover of Multi-meter box shall be individually in one piece except for fixing of accessories like hinges, clamp, handles etc, CRCA MS Fabrication and all metal part shall be Zinc –Passivated.

5.02 In case of Deep drawn type Multi-meter boxes, the rounding of corners and slope on Top shall be as shown in the drawing. No joints in the body of the Box are permitted in Deep Drawn Process.

In case of fabricated box sharp corners & one side slope will be acceptable. The fabrication boxes, involving welding, shall not have more than two joints

5.03

a. For Multi-Meter Box made from Glass reinforced polyester sheet moulding compound (S3 grade)- The wall thickness of Multi-Meter box shall not be less than 3 mm on load bearing side and 2 mm for all other sides including door.

b. For Multi-Meter Box made from Polycarbonate material -The wall thickness of Multi-Meter box shall not be less than 3 mm on load bearing side and 2 mm for all other sides including door.

c. For Multi-Meter Box made from CRCA MS Deep Drawn or Fabrication - The thickness of Multi-Meter box shall not be less than 2 mm all sides including door.

5.04 Multi-Meter box shall be so constructed so as to have roof tapering down for easy flow of rain water.

5.05 It shall be anti corrosive, dust proof, vermin and water proof, Ultra violet ageing test stabilized and flame-retardant property

5.06 The internal dimensions of Multi-Meter box shall be as under

Sr. No.

Description Internal Dimensions (Min) Ht x Width x Depth (mm)

1 Multi-Meter Box for Housing 4 Nos. Single Phase Meter 530 x 450 x 150 mm 2 Multi-Meter Box for Housing 8 Nos. Single Phase Meter 750 x 690 x 150 mm 3 Multi-Meter Box for Housing 12 Nos. Single Phase Meter 1000 x 690 x 150 mm

4 Multi-Meter Box for Housing 18 Nos. Single Phase Meter 1100 x 1100 x 150 mm

5.07 The Multi-Meter Box should have viewing window as shown in the drawing.

5.08 The viewing window shall be provided with toughened glass of 5 mm thickness and Minimum 5 mm over lapping of glass with viewing window. The glass shall be fixed from inside of the cover of Multi-meter box with stainless steel frame (glass holder)with suitable rubber gasket from inside the cover, so that it can withstand weather effect.

5.09 The multi meter box should not change in color, shape, size, dimension when subjected to 200 hours on Ultra violet ageing test for SMC and polycarbonate material. Also it shall be capable of withstanding temperature of boiling water for five minutes continuously without distortion or softening.

5.10 The Multi Meter box shall be fixed by stainless steel concealed hinges on one side with hardware from insides in such a manner that it can’t be manipulated from outside. It should have locking arrangement by way of sealing and can be opened without breaking.

5.11 Locking arrangement shall be such that MS Chrome Plated Triangular Lock with Key for locking of Multi-Meter Box to be provided.

5.12 The door in closed position should be overlapped on base such that direct entry of screwdriver, tool or film is not possible.

5.13 Multi-Meter Box shall confirm to IP-51.

5.14 The dimensions of bus bar shall be as under

Sr. No.

Description Dimensions (Min) Ht x Width x Depth

(mm) of Phase busbar

Dimensions (Min) Ht x Width x Depth

(mm) of neutral busbar

1 Multi-Meter Box for Housing 4 Nos. Single Phase Meter

160 x 20 x 5 mm 160 x 20 x 5 mm


300 x 25 x 6 mm 3 no.

300 x 40 x 6 mm


300 x 25 x 6 mm 3no.

300 x 40 x 6 mm


390 x 25 x 8 mm 3no.

390 x 50 x 6 mm

5.15 Phase busbars shall be placed in bottom right of multi meter box and neutral busbar shall be placed in bottom left of multi meter box as indicated in drawing.

5.16 The mounting arrangement of the meter shall be on 10 mm thick Particle Board as per drawing

5.17 For fixing on wall mounting, flat is to be provided along with nut bolts with the Multi-Meter box as shown in the drawing.

For pole mounting, necessary M.S. Clamp arrangement to be made for mounting the Multi-Meter Box on pole

5.18 Incoming and Outgoing cable entry holes shall be as under

Sr. No.

Description Incoming Cable entry hole

Outgoing Cable Entry hole


1 No. Dia. 32 mm Incoming Cable entry hole with

Gland should be provided at base as

shown in the drawing.

4 Nos. Dia. 16 mm Outgoing cable entry holes with Gland as



2 Nos. Dia. 32 mm

Incoming Cable entry hole with

Gland should be provided at base as


8 Nos. Dia. 16 mm Outgoing cable entry holes with Gland as

shown in the drawing. 3 Multi-Meter Box for Housing 12

Nos. Single Phase Meter 12 Nos. Dia. 16 mm Outgoing cable entry holes with Gland as

shown in the drawing. 4 Multi-Meter Box for Housing 18

Nos. Single Phase Meter 18 Nos. Dia. 16 mm Outgoing cable entry holes with Gland as


5.19 The surface appearance of part must be smooth, non porous and homogeneous, free of ripples, defects and marks. No fillers or fibers should be visible at any place

6.00 TESTS

6.01 TYPE TESTS

The multi meter box shall have been successfully type tested as per IS: 14772 / 2000 from NABL Accredited independent testing laboratories such as CPRI/ERDA. The type test report shall clearly indicate the constructional features of the type tested multi meter box. The tenderer shall also furnish certificate from laboratories where type test carried out. The requisite test facility available in house for that particular test shall be approved by NABL. The type tests conducted in manufacturer’s own laboratory and certified by testing institute shall not be acceptable. The tenderer shall also furnish the particulars giving specific required details of multi meter box in schedule ‘A’ attached (As per Guaranteed Technical Particulars uploaded on e - Tendering site). The offers without the details in schedule ‘A’ and Type Test reports stands rejected.

A. Type Test, Acceptance Tests and Routine tests for Sheet Moulding Compound

(SMC) Multi Meter Box

The Enclosure Sheet Moulding Compound (SMC) conforming IS: 13410-1992 should have following properties:

I. Type tests Sr.no Test Details Requirement for S3

electrical Grade Reference standard

1. Glass Content , % by mass, minimum

20 Annexure –A of IS : 13411: 1992

2. Flexural Strength, MPa 170 Annex. F of IS 13411:1992. 3. Modulus of Elasticity,

103 MPa 12 to 15 IS 8543 (Part 4/Sec 1) : 1984

4. Tracking Resistance CTI, Min

1000 IS2824:1975

5. Dielectric Strength at 90°C In Oil KV/Min

11 IS 6262:1971

6. Dissipation factor (4 days at 80% RH & 1 KHz)

0.01 IS4486:1967

7. Heat Distortion Temperature, C, Min

150 Annex. H of 13411:1992

8. Oxygen Index, % Min 24 IS 13360 (Part6/Sec6):1992 9. Flammability ( Vo) - UL 94 or IS : 11731 (Pt.II)

10. Glow wire test - IEC – 695 –2-1 or IS :11000(Pt 2/sec.1)

11. Ball pressure test - IEC : 335 12. Mechanical Strength - IS : 14772 13. Spirit burner test (Self

Extinguishing) - IS : 4249

14. Melting point (to test up to 400ºC) should not melt

IS :13360

II. Acceptance tests

Sr.no Test Details Requirement for S3 electrical Grade

Reference standard

1. Flow, mm, Min 170 Annexure – C of IS : 13411: 1992

2. Mould shrinkage , linear percent, Max

0.25 Annexure – B of IS : 13411: 1992

3. Water Absorption, % Max. 0.01 Annex. D of of IS : 13411: 1992

4. Izod Impact Strength (Notched), KJ/m2, Min

55 Annex.E of IS : 13411: 1992

5. Tensile Strength , MPa, Min 70 IS:8543 (part 4/1984) 6. Power Arc Resistance, sec,

Min 180 Annex. G of IS 13411:1992

III. Routine tests Sr.no Test Details Requirement for S3

electrical Grade Reference standard

1. Density of Moulding , g/ml 1.8 to 2.1 IS:8543 (part 1/Sec2:1970) 2. Surface Resistivity (24H in

Water), Ohm, Min 1x1013 IS3396:1979

3. Volume Resistivity , Ohm-cm, Min

1x1014 IS3396:1979

4. Marking, Dimensions and construction

- IS : 14772

B. Type Test & Acceptance Tests for Polycarbonate Material Meter Box

I. The tests for properties of polycarbonate material confirming to IS:14434:1998 are

mentioned below: a) Specific gravity b) Flexural Modulus c) Impact strength d) Temperature Deflection under load e) Volume resistivity f) Dielectric strength g) Dielectric constant h) Dissipation factor i) Flammability test

Following tests shall be conducted on meter cover confirming to IS:14772/2000 and

IS:14434/1998 as mentioned below:

Sr. No. Test Reference Standard 1. Material Identification of Cover (poly carbonate) IS:14434/1998 2. Marking, Dimension & Construction IS:14772 / 2000 3. Protection against electric shock IS:14772 / 2000 4. Provision for earthing IS:14772 / 2000 5. Resistance to ageing, humid conditions, Ingress of solid objects and

to harmful ingress of water IS:14772 / 2000

6. Mechanical strength IS:14772 / 2000 7. Resistance to heat/ Ball Pressure Test IS:14772 / 2000 8. Resistance of insulating material to abnormal heat and fire IS:14772 / 2000 9. Resistance to Tracking IS:14772 / 2000 10. Flammability (V2) UL 94 or IS: 11731

(Part. II) 11. Self extinguishing IS: 4249/1967 12. Heat deflection temperature ISO 75 13. Glow Wire Test IS: 11000 (Part 2/ Sec-

1) or IEC –60695-2-12

14. Ball Pressure Test IEC: 335 or IEC-60695-10-2

15. Water Absorption IS:5133 (Part-II)-1969 16. Light Transmission (Transparency) for Cover ASTM D 1003 17. UV Ageing Test for 200 Hours ASTM G53 (9.3)

6.02 ACCEPTANCE AND ROUTINE TESTS

The following Tests shall constitute the Acceptance & Routine Tests. All Acceptance & Routine Tests shall be carried out by supplier in presence of Purchaser’s Representative.

Immediately after finalization of the program of Type/Acceptance/Routine testing, the supplier shall give three weeks advance intimation to purchaser, to enable him to depute his representative for witnessing the tests

Sr. No.

Test Reference Standard

1 Marking IS 14772:2000

2 Dimensions IS 14772:2000

3 Protection against Electric Shock IS 14772:2000

4 Provision for Earthing IS 14772:2000

5 Construction IS 14772:2000

6 Resistance to Ageing, to humid condition, to ingress of solid objects and to harmful ingress of water

IS 14772:2000

7 Mechanical Strength IS 14772:2000

8 Density of Moulding, g/ml IS:13410-1992

9 Surface Resistivity (24 hrs in water), Ohm IS:13410-1992

10 Volume Resistivity, Ohm-cm IS:13410-1992

11 Impact Strength, KJ/m2 IS:13410-1992

12 Tensile Strength, MPa IS:13410-1992

13 Power Arc Resistance, sec IS:13410-1992

14 Heat Distortion Temperature, Deg. C IS:13410-1992

7.00 TESTING AND MANUFACTURING FACILITIES

7.01 The manufacturer shall have necessary machinery for production of SMC/Polycarbonate/ CRCA MS Deep Drawn or Fabrication Multi meter box

7.02 The manufacturer shall have in house testing facilities for carrying out following tests:

Sr. No.

Test Details Reference standard

1. Flammability (V2) UL 94 or IS: 11731 (Pt. II)

2. Heat deflection temp. at (min. 150OC) 0.45 SUB MPA Load ISO 75

3. Glow wire test IEC–695–2-1 or IS: 11000 (Pt 2/sec.1)

4. Ball pressure test IEC: 335 5. Water absorption IS: 14772 6. Mechanical Strength IS: 14772

7. Marking Dimensions and construction IS: 14772 8. Spirit burner test IS: 4249

8.00 DRAWING /SAMPLE:

Enclosed drawings are only for general guidelines, however, the detailed dimensional drawing showing clearly the dimensions and material of Multi-Meter Box and its constructional features should invariably furnished with the offer.

9.00 MARKING / EMBOSSING

The following information shall be clearly and indelibly embossed (not printed) on the cover of the Multi-meter box except Sr. No. which may be indelibly printed with inkjet printing on the base and cover of the Multi- meter box.

(i) Purchase order number and date.

(ii) Year and month of manufacture.

(iii) Purchaser's name: MSEDCL

(iv) Guarantee: 1 Year.

(v) Sign of danger.

(vi) Code name of manufacturer

10.00 PACKING

The Multi-meter box shall be suitably packed in corrugated boxes in order to avoid damage during transit or handling

GURANTEED TECHNICAL PARTICULARS OF MULTI-METER BOXES SUITABE FOR

HOUSING 4 NOS. OF METERS

Sr. No.

Particulars Required Offered

1 Material Glass reinforced polyester sheet Moulding compound (SMC)/Polycarbonate/ CRCA MS Deep Drawn or Fabrication

2 Grade of Material As per IS:13410-1992/ IS: 14434-1998 3 Properties of Material of Construction of Multi-Meter Box A Flammability

(Ref. Std: UL-94 / IS-11731 V0

b Heat Deflection Temperature (Ref. Std. IS:13411)

150 Deg. C (Minimum)

C Exposure to Flame (Ref. Std. IS – 4249

Self Extinguishing

D Melting Point (Ref. Std. IS-13360

Does not Melt

4 Constructional features of the Multi-Meter Box: 4(a) Clear inside dimensions

i. Height 530 mm ii. Width 450 mm iii. Depth 150 mm iv. Thickness 3 mm on load bearing side and 2mm all

other sides including door

4(b) Window on front door: i. Material of Viewing Window Toughened Glass ii. No. of Viewing Window 2 Nos. iii. Thickness of Toughened Glass 5 mm iv. Size of opening (Min) 366 x 120 mm (+ 5 mm) v. Fixing method Fixed from inside with stainless steel

frame and gasket

5

Hinges Stainless Steel Continuous Strip Hinge

6 Locking Arrangement 2 Nos. MS Chrome Plated Triangular Lock with Common Key

7 Pad Locking Arrangement Hole for pad locking to be provided 8 Sealing Arrangement Holes for Wire Seal in SS Door Closing

Clamp

9 Earthing Bolt 2 Nos. Earthing bolt of MS zinc Passivated of size M6 x 25 mm long with two nuts and two washer.

10 Wire Entry Incoming Cables 1 No. Dia. 32 mm Incoming Cable entry hole with Gland at the base

11 Wire Entry Outgoing Cables 4 Nos. Dia. 16 mm Outgoing cable entry holes with Gland

12 Meter Mounting Arrangement 10 mm thick particle board 13 Ingress Protection (IP) IP-51

GUARANTEED TECHNICAL PARTICULARS OF MULTI-METER BOXES SUITABE FOR HOUSING 8 NOS. OF METERS

Sr. No.


1 Material Glass reinforced polyester sheet Moulding compound (SMC) /Polycarbonate/CRCA MS Deep Drawn or Fabrication

2 Grade of Material As per IS:13410-1992 /IS: 14434-1998 3 Properties of Material of Construction of Multi-Meter Box a Flammability

(Ref. Std: UL-94 / IS-11731 V0




Self Extinguishing


Does not Melt





frame and gasket

5


6 Handle 1 Nos. Stainless Steel Handle 7 Locking Arrangement 2 Nos. MS Chrome Plated Triangular

Lock with Common Key

8 Pad Locking Arrangement Hole for padlocking to be provided 9 Sealing Arrangement Holes for Wire Seal in SS Door Closing

Clamp


11 Wire Entry Incoming Cables 2 Nos. Dia. 32 mm Incoming Cable entry hole with Gland at the base


13 Louvers 1 Nos. FRP Louver on each side wall

Sr. No.


14 Meter Mounting Arrangement 10 mm thick particle board 15 PVC Wire Alley for wiring 2 Nos. 16 Ingress Protection (IP) IP-51 17 Bus Bar for Phase (R,Y,B) Aluminum Bus Bar of size 25 x 8 mm

with Insulation tape having M6 x 20 mm bolts

18 Bus Bar for Neutral Aluminum Bus Bar of size 40 x 6 mm with Insulation tape having M6 x 20 mm bolts

19 Bus Bar SMC Step for Bus Bar mounting 20 Colour of Meter Box Off White

GURANTEED TECHNICAL PARTICULARS OF MULTI-METER BOXES SUITABE FOR HOUSING 12 NOS. OF METERS

Sr. No.



2 Grade of Material As per IS:13410-1992/ IS: 14434-1998 3 Properties of Material of Construction of Multi-Meter Box a Flammability

(Ref. Std: UL-94 / IS-11731 V0




Self Extinguishing


Does not Melt





frame and gasket

5




8 Pad Locking Arrangement 1 Nos. Padlocking arrangement of 2 mm thick SS-304

9 Sealing Arrangement Holes for Wire Seal in SS Door Closing Clamp


11 Wire Entry Incoming Cables Dia. 32 mm Incoming Cable entry hole with Gland at the base



Sr. No.






GURANTEED TECHNICAL PARTICULARS OF MULTI-METER BOXES SUITABE FOR

HOUSING 18 NOS. OF METERS

Sr. No.



2 Grade of Material As per IS:13410-1992 /IS: 14434-1998 3 Properties of Material of Construction of Multi-Meter Box a Flammability

(Ref. Std: UL-94 / IS-11731 V0




Self Extinguishing


Does not Melt


i. Height 1100 mm ii. Width 1100 mm iii. Depth 150 mm iv. Thickness 3 mm load bearing side and 2mm all



frame and gasket

5




8 Pad Locking Arrangement 1 Nos. Padlocking arrangement of 2 mm thick SS-304


10 Wire Entry Incoming Cables 2 Nos. Dia. 32 mm Incoming Cable entry hole with Gland at the base



Sr. No.






technical specification for for multi-meter box …€¦ · 5.02 in case of deep drawn type...

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